Air-cock



W. M. ROBINSON.

AIR COCK.

APPLICATION FIL'ED JAN. L0, 1918:.

Patented Aug. 30, 1921.

Ill

I illustrated, and

pneumatic systems.

UNITED STATES PATENT; OFFICE.

MASSACHUSETTS.

Specification of Letters Patent.

Patented ug. 30, 1921.-

nb ncation'mea January 1o, 1918, serial No. 211,293.

To allwhom it may consent:-

7 Be it known that I, WALTER M. ROBINSON, a citizen of the United States, residing at Arlington, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Air-Cocks, f which the" following is a specification.

The object of thls invention is to provide an improved valvefor use in high pressure 11 the accompanying drawing, -I have Ishall'hereinafter describe indetail, one embodiment of the invention,

v which is the best but which is capable of various modifications and changes in the details of its'construction and-arrangement of parts without departure from the spirit of the invention as outlined in the-appended claims, Referring to said drawin'gs,

Figure 1 represents a side elevation of the valve.

' Fig. 5 represents the main casing in sec ,tion and illustrates the formation of .lubri:

Fig. 2 represents section of the Valve,

lng variations in the Structureat one'of the nlpplesito enable it to be connected of CD11",

pled to .complemental members of; the" air conduit.

the line 3-,3 of Fig. 2. i

,Fig. 4 represents-avertical section through the plug,.the lowerend of which-is broken 4 eating ducts in'the plug seat.'

I In accordance with the present invention, my improved Valve -is' provided with a frusto-conicalseat, "surmounted at its .reduced end by exert pressure .again'sta frustog .1 0 draw it'i t its seatp casing is indicatedas a'whole at'=-10,"-and*is grasped by '.-a wrench shown as exterior wlth exterior lowerportion off the having a substantially cylindrical 11, 11, on both sides sothat .it may be or other implement-g directions from the v ro ectingljin opposite form now known .to me,

the nipples, is an aperture 16 a longitudinal vertical the dotted lines indicat- ,brought into formed by Fig. 3 represents a horizontal section on.

.and closing a spring chamber, in which thereiis located a compression spring arful ranged to r conical'lpl'u Proceeding to a more detailed description of the-particular embodiment of the inveiI-"i" tion' illustrated -'on the drawings,

the valve space between it projecting flush ribs casing arecoupling members by which the valveasja whole i'nay' be attached to the conduit members of the system. "As shown by Fig.1, these coupling drical and the latter tapering.v Either or b0th of thesememb'ers may be varied toisu'it b0 partlcular requirements. Forexample, the member 13 may be unthreaded and extended o and provided with a circularflange as shown municates with the pin which forms inlet am? conical, and is carefully ground soas a'ccuratelyto fit the seat The plug-has a transv Verse port 19' or passageway which may be registration with the ports ,80"

the aperture. 16, and which is of larger size thamthediameter of said aperture, so that thecapacity of the valve will not be aflected by longitudinal adjustment. of the plug as the parts become worn or are I reground. The plug may be cast hollow-as shown to lighten it, its lower end beingisolid the larger end of 'the .frustoconical seatl 'l ,Above the seat, the

casing is fo'ri n ed a. bonnetwhich furnishes a relatively large" compression spring. 22. "The 'pluglis" {formed with ajreduced cylindrical fstem'231185 extending upwardly from the smallerlujpper jspring chamber and fs ufii nd through the .ciently small in .diameter to 1e'a've"a1'np le -to the stem and against it bears-fthe upper end of the spring thereby firmly to draw the f plug. endwise into its 's'eatfThe cap is located on an angular (hexagonal if desired) portion"25 .ofthe stem' and 'abutsa shoulder 6 -26 thereon. I

nut 27 0 1. the threadeg -T the bores of 702:,

and thewall of the sgrin' chamber for the spring. A-cap-24 is secure .0

. tremity 28 of the stem removably clamps the cap against-the shoulder 26. Said cap has a depending marginal flange which incloses the upper end of the spring chamber, and affords a fairly tight fit. To prevent the plug from being rotated through an arc of more than 90 in closing, the casing and the cap have cooperative stops 29, 30, respectively.

A. handle for operating the plug is desirable and it may be secured to the stem'of the plug. With convenience it may be cast as an integral part of the cap and project radially therefrom as indicated at 31.

It is frequently desirable to lubricate the plug and its seat. Hence I have shown the plug stem as having a bore 32, the upper end of whichis closedby a screw plug 33 and the lower end of which has lateral outlets 34, 34, terminating between the planes of the upper and lower ends of the plug seat 17 and I have also shown the seat as having vertical grooves 35 which terminate between the ends thereof, with which said outlets may register when the plug is oscillated. Preferably the grooves are located at points where the outlets will not register therewith when the plug is at the extremes of its oscillatory movement. Any suitable lubricant, grease or oil is introduced into the bore of the plug stem, and the screw plug inserted in place. Any. other, means for affording lubrication of the parts may be em loyed.

n disassembling the parts, the nut 27 is removed, the cap and handle slipped from the end of the stem, and the plug is moved in the direction of its larger end. The seat and the plug may now be reground. To assist in regrinding the plug, its lower and larger end is cast with a reduced angular boss 36 having a r "ntrant centering point 37 so that it may be easily grasped by and centered in the chuck of a grinding spindle without injurg,

n advantage of the construction which I have described is the simplicity of the structure, which renders unnecessary and in fact prevents variation in the spring pressure by attempts to adjust the parts. he spring is placed under the desired degree of compression between the shoulder 21 and the cap, when the nut 27 is forced home sufliciently to seat the cap against the the stem, and of course a spring of such strength as may be necessary is initially selected. Other advantages are due to the ease with which the parts may be assembled. and taken apart, to the formation of the spring chamber and its closure to prevent access of dust thereto, and' to the facility with which. the plug and its seat may be ground and re-'-'- ground.

Having thus explained ,the'nature of my said inventlon and described away of makwith its seat.

shoulder 26 of 1. An air valve comprising a casing provided with laterally projecting. coupling members and having a frusto-conical seat and a bonnet which pro- 'des a spring chamber above the smaller end of said seat, a plug in said seat having an unobstructed frusto-conical contour and having a shoulder'ed stem at its smaller end extending through said spring chamber and having its larger end solid and closing the larger end of said seat, a cap seated against the shoulder on said stem and having an'annular flange overlapping the bonnet, a handle extending from said cap, a nut on said stem clamping the cap. against said shoulder, and a spring located in said chamber and having one end bearing against the bottom of said chamber and its upper end bearing against said cap and acting to hold said plug in constant close bearing relation to said seat.

2. An air valve comprising a casing having a central frusto-conical chamber or seat with outlet and inlet ports leading thereto, and having a bonnet furnishing a shouldered spring chamber axially surmounting the central seat, a plug in said centralchamher having an unobstructed frusto-conical contour andl having a reduced stem at its smaller end extending axially through said spring chamber, the larger end of the plug,

being solid and completely closing the larger end of said central chamber, and said plug having a lateral through passageway for registration with said outlet and inlet ports, a combined handle and cap on said stem closing the upper end of said spring chamber, means for securing the handle on the stem, and a spring in said spring chamber, encircling the stem and having one end bearing against an internal shoulder in the spring chamber, and the other end acting to hold said plug continuously into engagement 3. An air valve, comprising a casing having a frusto-conical valve seat therein, .a valve plug having an unobstructed frustoconical contour located in said valve seat, a shouldered spring cham'ber located above the small end-of the valveseat, a stem on the small end of the valve plug extending through 'saidspring chamber, cap and handle on the end of said plug having an annular flange fitting snugly about the upper end of the chamber, a spring in saidchamber bearing at its ends against said shoulder and said cap and exerting pressure tending to draw the valve plug upward in uniformly close fitting relation in said. seat to compensate for wear. In testimony whereof I have afiixed my signature.

WALTER M. ROBINSON.

a combined 

